CN118901698A - Termite killing prevention and control method for reservoir dam - Google Patents

Abstract

The invention relates to the technical field of termite control on reservoir dams, and specifically to a method for controlling termites on reservoir dams, comprising the following steps: 1) preparing a medicament indoors away from a reservoir site by using fipronil or imidacloprid; 2) soaking tree bark with the prepared medicament to obtain a bait; 3) placing the bait in a device isolating soil and water bodies, so that the medicament drifting due to spraying or powdering will not occur, and through the feeding behavior and trophallaxis behavior of termites, the action mechanism of fipronil or imidacloprid, and the behavioral performance of termites under a specific proportion of the medicament, it is ensured that the termites can bring a large proportion of the placed bait back to their nests.

Description

A method for controlling termites in reservoir dams

Technical Field

The invention relates to the technical field of reservoir dam termite control, and in particular to a reservoir dam termite extermination and control method.

Background Art

In important water conservancy projects such as reservoirs and dams, it is very important to prevent and control termites, because the activities of termites will directly threaten the safety and stability of water conservancy facilities. However, in the current termite prevention and control work of reservoir dams, it is required to follow the principles of "prevention first, combination of prevention and control, comprehensive management, continuous control, scientific and technological empowerment, green safety". As an important carrier of the water ecological system and the construction of beautiful rivers and lakes, reservoir dams must adhere to the new concept of "ecological priority, green development", and the control measures should not pollute the air, soil and water quality, and should not harm the safety of the main project.

The existing termite control methods are as follows:

1. Digging nest method: artificially digging dams to find termite nests. It is a traditional method with a long history.

The nest location is determined by using the distribution image of the black-winged termite colonies and holes, fungal indicators, cone probes to find the ant nest, the location of the ant nest is determined based on surface signs of termite activity, the nest location is determined based on topography and signs of termite activity, and ground penetrating radar, high-density resistivity method and other instruments are used to determine the ant nest.

When digging out ant nests, you should dig continuously, take out the main nest and all secondary nests, capture the ant king and queen, and kill the remaining termites. After the nest is removed, the loose soil around it should be removed in time, and the soil similar to the original soil of the project should be used to fill and compact it to the original state.

Because different types of termites have different nest sizes and numbers (for example, the main nest of adult black-winged termites is large and the secondary nest is small, while the nest of yellow-winged termites is small but large in number); the same type of termites has different development processes, such as immature nests and small nests that are difficult to find, making it difficult to eradicate all nests at once. Or the nest is too deep, the stone slope is difficult to find the cluster holes and nest indicators, resulting in nests being dug every year and there being nests every year, forming a cycle year after year.

The nest digging method requires excavation of soil or dam structure, but it is easy to cause physical damage to dams and other structures during the nest digging process, affecting the stability of the dam. Therefore, there are many limitations to the nest digging method. During the flood season and high water level period, nest digging cannot be done for dam safety reasons; for dams with complex structures such as earth-rock dams and reservoirs, termites travel through the stones, making it difficult to dig nests. In addition, the Ministry of Water Resources' "Technical Guidelines for Termite Control in Water Conservancy Projects (Trial)" also clearly requires that "the nest digging method should not be used to kill termites during the flood season or high water level operation"; in the case of block stone slope protection and stone masonry slope protection, the blocks and masonry stones cannot be removed to dig nests. Therefore, the nest digging method is not easy to dig nests, and the nest digging is not thorough. It also affects the dam structure and stability to a certain extent, bringing safety hazards.

2. Spraying method: Directly place special termite control drugs on the reservoir dam where there are traces of termite activity or on the back slope of the reservoir dam and its surroundings. Common spraying methods include the following:

1) Drug treatment on the surface of the dam: Use "≥10% imidacloprid suspension" concentration liquid (1:200) to spray the dam surface comprehensively, ensuring that there is no gap on the dam body when applying the pesticide, and effectively kill the new colony on the dam body.

2) Drilling and injecting medicine on the dam surface: Use a steel drill to drill holes above the water level line of the dam's upstream slope, the dam top and the back slope. The specifications are that the hole depth is not less than 30-50CM, the hole diameter is 2-3CM, and the hole spacing is 1M×1M plum blossom pile arrangement. After the termite control agent is placed in each hole, it is sealed with soil to allow the drug to penetrate into the shallow soil layer of the dam body to form an effective drug barrier. This method can not only effectively kill termites, but also prevent termites from invading again.

At present, there are 98 registered termite control drugs, most of which are used for building prevention and wood treatment. Only one pesticide variety, "sulfuryl fluoride", is registered for termite control in water conservancy projects by fumigation. According to the Pesticide Management Regulations, pesticide users should strictly follow the scope of use, method of use and dosage, technical requirements and precautions marked on the pesticide label. They shall not expand the scope of use, increase the dosage or change the method of use. At the same time, the Pesticide Management Regulations also stipulate that it is strictly prohibited to use pesticides in drinking water source protection areas. If these registered pesticide varieties are used for "dam surface drug treatment" and "dam surface drilling and drug injection", they cannot meet the requirements of laws and regulations for termite control in water conservancy projects, and cannot reasonably, scientifically and effectively control termites.

3. Powder spraying method: directly spray the termite-killing powder so that some termites are contaminated with the powder to kill or control the termite colony.

The spraying method should be carried out in accordance with the requirements for the use of control drugs. When inspecting the ant-infested area of the reservoir dam, if termites are found in the flying holes and ant tunnels, or termites are lured by setting bait, or termites are found in the main (secondary) nest of termites when digging the nest, the drug powder should be sprayed directly on the termites, and the termite-killing powder should be directly sprayed with a powder sprayer. The termites are killed by the "licking behavior" of the termites. When spraying, the principle of "more points and less use" should be followed.

At present, there are 8 registered pesticides in the form of "powder" for killing termites, including 6 fipronil, and the registered scope of use is only "buildings", "indoors", and "sanitation". The labels clearly state: "This product is prohibited for outdoor use", "This product is only for indoor use", "Stay away from aquaculture areas, rivers and ponds and other water bodies;", "Prohibited in and near rivers and ponds and other water bodies". Another registered active ingredient is "chlorfenapyr", and its label clearly states "This product is only for indoor use." Another active ingredient is "cypermethrin", and its label also states "This product is only for indoor use." When using the powder spray method to control termites on reservoir dams, there is actually no pesticide to spray.

When using the powder spraying method, some pesticides diffuse in the atmosphere and migrate to non-pesticide application areas along air currents and wind directions, and enter the water environment or surrounding areas along dust and precipitation, causing great harm to the environment. This method used in the past has clearly caused damage to the environment, water bodies, and ecology. For example, DDT and 666 have never been used in Antarctica, but their presence has been detected in Antarctic snow.

4. Drug grouting method: Pour mud mixed with termite control agent into ant nests, cavities and ant tunnels.

Grouting to kill termites requires the ant paths to be more than 2 cm. At the same time, termite paths in earth dams are complexly distributed in a criss-cross pattern rather than purely vertically distributed. It is very easy to block the ant paths during drug grouting, and the nests cannot be reached, resulting in poor control effects. In water conservancy projects in drinking water source protection areas, the chemicals used for drug grouting can penetrate into the soil and pollute the water source, so drug grouting should not be used to kill termites. In water conservancy projects in other water source protection areas, drug grouting should also be used with caution to kill termites.

5. Fumigation: Fumigation is a method of killing termites by injecting gas through the main ant tunnels.

Sulfuryl fluoride is the only agent that has obtained legal registration for the prevention and control of earth dam termites. However, the use of this method requires high technical requirements and requires finding the main ant tunnel, which is difficult. At the same time, the agent states that "personnel using this product should be trained and assessed by relevant departments and obtain corresponding technical certificates and job certificates before they can operate it. The manufacturer has a dedicated person to handle empty cylinders. Operators using this product should wear protective equipment to prevent gas from being inhaled into the human body, and also prevent liquid from contacting the skin and eyes." It can be seen that the fumigation method is difficult to operate, has high labor costs, and has high safety risks.

6. Bait killing method: Add termite medicine to the materials that termites like to eat to make bait, lure termites to eat, and bring the medicine back to the ant nest to kill the termites.

When termites are found in the monitoring device, the monitoring wood is removed and bait is put in instead. The termites are treated with the chronic poison in the bait and bring the poison back to the ant nest. By utilizing the termites' trophallaxis and other behaviors, the entire termite colony is poisoned. Regular inspections are carried out and the bait is replenished in time until the termite colony is eliminated.

Currently, the existing products registered as baits for the control of termites include three active ingredients: fluflumuron, chlorpyrifos and ivermectin. However, the registration labels clearly state: fluflumuron "has no control effect on soil termites and macrotermes"; chlorpyrifos "must not be used for the control of termites on dams"; and ivermectin "is prohibited near rivers, ponds and other water bodies". As a result, there is also a phenomenon of no medicine available when using the bait-killing method to control termites on reservoir dams.

In summary, the current methods of controlling termites have a wide range of drug exposure, a large amount of drug use, and high toxicity in the process of killing termites. They have a great impact on other non-target organisms in the environment, such as high toxicity to birds, high toxicity to bees, severe toxicity to silkworms, and toxicity to fish. It is impossible to achieve precise drug application, that is, to apply drugs to target pests, namely termites, and not to non-target organisms; it is impossible to achieve timely drug application, that is, to kill termites during the peak period of termite activity or when the traps go out. It is impossible to control the migration of drugs, that is, drugs are easy to migrate in the soil, and even pollute water bodies, which is harmful to the environment and poses a great safety hazard. Obtain legally registered drugs for the control of termites, and use them according to the scope of use, method of use, and prohibited matters marked on the drug label. Most drugs are not allowed to be used in reservoir dam areas. Moreover, the drugs knock down quickly, and most termites cannot return to the ant nest, and a large number of them die around the bait, causing the bait to lose its appeal to termites.

Summary of the invention

The present invention provides a method for controlling termites in reservoir dams, which can solve the problems that existing termite control methods are difficult to implement, cannot be applied, and have limited safety; it can solve the problems that the drug exposure range is wide, the drug toxicity is high, the impact on non-target organisms is large, precise drug application cannot be achieved, drug migration cannot be controlled, and the harm to the environment is large.

This application provides the following technical solutions:

A method for controlling termites in a reservoir dam comprises the following steps:

1) Prepare a drug using fipronil or imidacloprid; 2) Soak bark with the prepared drug to obtain a bait; 3) Place the bait and allow termites to bring the placed bait back to the ant nest.

Beneficial effect: Wood is the favorite food of termites. There are two traditional wood treatment methods: soaking and brushing. Its purpose is to protect the wooden structure of the house, or decorative wooden materials, furniture, etc. from the harm of termite decay, so the direction of its drug selection is to use fast knockdown power to quickly kill termites with products such as bifenthrin, permethrin, cypermethrin, etc., or select products such as chlorantraniliprole that take effect quickly and stop feeding within a few minutes. When processing wood, only a short soaking time (not requiring the wood to be fully soaked) or a certain amount of medicaments are brushed on the wood surface, so the active ingredient of the medicament usually stays on the wood surface, and cannot be immersed in the middle of the wood. At the same time, existing finished baits, such as chlorpyrifos, hexaflumuron, ivermectin, etc., although can be used around house buildings, need timely and long-term routine inspections and supplementary baits, until the whole nest of termites is killed and the bait can be stopped. However, reservoirs in mountainous areas are far away and inconvenient to inspect. At the same time, the populations of soil termites and giant termites are large, and there are many generations of insects. They have no effect on mature worker ants, soldier ants, ant kings, queen ants and other termites that no longer molt. Even if more time or even more than two years is invested, they cannot be exterminated. Therefore, some registered bait varieties clearly state on the label that "this product has no control effect on soil termites and giant termites" and "this product must not be used for termite control on dams."

The conditions, requirements, varieties and concentrations for the selection of pesticides are as follows: 1) Abandon medium-toxic varieties and select low-toxic varieties. 2) Obtain registered varieties of pesticides for the control of termites; 3) Products with slow knockdown speed, low saturated vapor pressure, low water solubility, poor mobility in soil and high KOC value.

This technical solution uses fipronil or imidacloprid to prepare the agent, which is easy to obtain and prepare. The bait obtained by preparing the agent has a slow knockdown speed, and termites will not die immediately after eating it, so that termites have sufficient time to bring the bait back to the ant nest and share food with their companions, which is convenient for the agent to fully spread in the ant nest, causing the entire termite colony to gradually weaken until death. At the same time, it can effectively avoid the death of a large number of termites where the bait is placed, causing the termites to avoid behavior and causing the bait to fail. It can also exert its medicinal effect on worker ants, soldier ants, ant kings, queen ants, etc. in different growth stages. It can achieve the effect of "whole nest extermination".

This technical solution uses bark as the base material of the bait, rather than wood, to ensure that termites can fully feed. Through experiments, it was found that when the wood was soaked after adding a dye in water, the water after dyeing was not easy to enter the interior of the wood. Therefore, if wood is used for soaking, the effective ingredients of the agent will only be on the surface (unless the wood is loosened after soaking with chemical agents, the agent will reach the inside, but the chemical agent will interfere with the feeding of termites and reduce the preventive effect of the agent after soaking), and when part of the surface agent is eaten, the internal wood loses its preventive effect and nourishes termites as food. When bark is used for the test, the surface area of the bark increases and the bark has more holes, so the effective ingredients of the agent can easily penetrate into the entire bark, which not only increases the adsorption amount of the agent on the surface of the bark, but also increases the amount of immersion into the bark, which can ensure that termites can fully feed and prevent waste.

It can achieve the minimum exposure of the agent and meet the basic principles of pesticide safety. Regardless of the toxicity of the pesticide, it is the right thing to do and wise to minimize the exposure to the pesticide every time it is used. In legal, regulatory and practical terms, no pesticide is considered safe. They can only be applied in a safe manner, and qualified applicators take all necessary prevention and control measures to minimize and reduce exposure to all other non-target organisms and the environment, including water, air, soil, etc. This technical solution does not use soil treatment to prevent and eliminate termites on reservoir dams, effectively reducing the impact on other non-target organisms in the environment and avoiding water pollution. As a substitute for the original pesticides, it can achieve green control of termites and realize green forestry.

Preferably, in step 1), the concentration of the prepared agent is less than the median lethal concentration.

Beneficial effects: By controlling the concentration of the agent, the termites are knocked down slowly, so that the termites can bring the bait containing fipronil or imidacloprid back to the nest after feeding, and spread it in the colony through the food sharing mechanism, causing the entire termite colony to gradually die out. This chronic action mechanism can ensure that the agent is fully spread in the colony and achieve colony extermination.

Preferably, in step 3), the dose of the drug contained in the bait placed is greater than the median lethal dose.

Beneficial effect: Ensure that the agent is sufficient to effectively kill termites, thereby achieving the effect of killing the entire nest.

Preferably, in step 1), the concentration of the prepared agent is 0.5-0.7 times the lethal concentration.

Beneficial effects: The concentration of the prepared agent can not only ensure the knockdown speed of termites, but also ensure that no matter whether the termites are old or young, they can "get in, get out, and go back", maximizing the ability of termites to take enough bait and bring it back to the nest, so as to kill the entire nest of termites.

Preferably, in step 1), fipronil with an active ingredient content of 25 g/L and an emulsifiable concentrate is added with water according to a volume ratio, and the ratio of fipronil to water is 1:60-120 to obtain a fipronil formulated preparation.

Beneficial effects: Fipronil is an efficient and broad-spectrum insecticide with significant effects on termites. The existing Fipronil has four formulations: powder, suspension, microemulsion, and emulsifiable concentrate. Among them, the powder is used by contact and adhesion on the body surface, and acts through the inter-feeding behavior between termites, which is transmitted to each other. However, termites are not active outside at all times. When the number of insects that go out is insufficient, it is difficult to carry a sufficient amount of medicine back to the nest, and it is impossible to effectively kill termites in the entire nest; and according to regulations, Fipronil powder is not allowed to be used for termite control in reservoirs, which damages the environment. Fipronil (25 g/L, emulsifiable concentrate) is chosen because it is easier to adhere to the bark and less likely to be lost in the tide than suspension or microemulsion, and the control effect is better than microemulsion and suspension. At the same time, the bait soaked in Fipronil emulsifiable concentrate, through the action of stomach poison, uses the feeding behavior of termites to change passive administration into autonomous behavior of termites actively foraging.

Preferably, in step 1), imidacloprid with an active ingredient content of 70% and a dosage form of water-dispersible granules is used, and water is added according to a weight ratio, and the ratio of imidacloprid to water is 1:1000-1200 (imidacloprid with other active ingredient contents such as 10%, 15%, 20%, 35%, 80% and other suspensions, emulsions in water, water-dispersible granules, dispersible granules, etc. are all proportioned according to this concentration) to obtain an imidacloprid formulation.

Beneficial effects: Imidacloprid is a neonicotinoid insecticide. Unlike many rapidly lethal insecticides, imidacloprid at this concentration has a chronic effect on termites, meaning that termites do not die immediately after ingesting the agent, but instead undergo a latent period before gradually showing symptoms of poisoning, a process that may last from days to weeks. This characteristic helps the agent spread among termite colonies, because termites can still function normally before being poisoned, and can transmit the agent to other individuals, including worker ants, soldier ants, and reproductive ants, through food sharing and social behavior, ultimately affecting the entire colony.

Preferably, in step 2), the bark is soaked with the prepared agent until the bark is saturated, the bark is fished out, and dried in a ventilated place away from direct sunlight to obtain the bait.

Beneficial effects: The fiber structure of the bark can absorb the agent and is attractive to termites, increasing the chance of the agent coming into contact with termites. Drying in the shade can protect the stability of the agent and ensure that the bait remains active when used.

Preferably, in step 2), the bark is a dry bark with a rough surface and many holes or cracks. The bark can be one or more of camphor bark, pine bark, and eucalyptus bark.

Beneficial effects: Fresh bark usually contains more water, which will affect the penetration of the agent, while dry bark is easier to absorb the agent. The bark surface area is larger and the bark has more holes, so the active ingredients of the agent can easily penetrate the entire bark, not only increasing the amount of agent adsorbed on the surface of the bark, but also increasing the amount of agent infiltrated into the bark, ensuring that the concentration of the agent in the bark can still meet the requirements. Camphor bark, pine bark, and eucalyptus bark are all easy to obtain and low in cost, and can effectively attract termites to come and feed.

Preferably, the soaking time for soaking the bark is 48-72 hours.

Beneficial Effects: Make sure the agent is saturated and soaked throughout the bark.

Preferably, in step 3), the bait is placed in a device that isolates soil and water; after the bait is placed, the bait is regularly monitored and replenished.

Beneficial effects: The bait is placed in a device that isolates the soil and water, ensuring that the agent will not come into contact with the soil, water and other non-target organisms, and can also prevent it from being dispersed in the air for transfer, and will not cause drift caused by spraying or powdering, thus protecting the environment and improving the soil. It effectively controls and monitors termite activities, protects buildings and structures from damage by termites, and ensures the continued effectiveness and timeliness of control measures.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a diagram of dried camphor bark used in Experimental Example 1 of a method for controlling termites in a reservoir dam according to the present invention;

FIG. 2 is a diagram of dry poplar bark used in comparative example 3 of a method for controlling termites in a reservoir dam according to the present invention.

DETAILED DESCRIPTION

Embodiment 1

A method for controlling termites in a reservoir dam, characterized in that it comprises the following steps:

1) Preparation of the drug: Use fipronil or imidacloprid to prepare the drug indoors away from the reservoir site. The concentration of the prepared drug is less than the LC ₅₀ (also known as the half lethal concentration), and the concentration of the prepared drug can cause certain changes in termites, such as changes in the speed of termites' movements, slow reactions, etc.

The concentration of the prepared drug is 0.5-0.7 times the lethal concentration.

In this embodiment, fipronil with an active ingredient content of 25 g/L and an emulsifiable concentrate is used, and water is added according to a volume ratio, and the ratio of fipronil to water is 1:60-120 to obtain a fipronil prepared medicament.

2) Preparation of bait: In a room far from the reservoir site, use dry bark with a rough surface and many holes or cracks, soak the dry bark with the prepared agent obtained in step 1) until the bark is soaked with the agent, remove the bark, and dry it in the shade at room temperature in a ventilated place away from direct sunlight to obtain the bait. The bark can be one or more of camphor bark, pine bark, and eucalyptus bark. The bark is soaked at room temperature for 48-72 hours to ensure that the prepared agent soaks and permeates the entire bark.

Method to judge whether the bark is soaked: Cut the bark in the middle and observe the color of the cross section to confirm whether the bark is penetrated. If the color of the cross section of the bark is consistent, it is judged that the bark is soaked with the agent; if the color of the cross section of the bark is inconsistent, with the outer side darker and the inner side lighter, it is judged that the bark is not soaked with the agent.

How to judge whether the bark is shade-dried: Cut the bark in the middle and observe the color of the cross section to confirm whether the bark is shade-dried. If the color of the cross section is consistent, the bark is shade-dried; if the color of the cross section is inconsistent, the bark is not shade-dried.

3) Placing the bait: Place the bait in a device that isolates the soil and water, and bury the device in the soil surface layer.

As shown in Figure 1, this embodiment uses a monitoring station. When signs of termite activity (mud roads, mud quilts, feeding, grouping holes, etc.) are found in the dam body or the termite monitoring station, the monitoring wood previously buried in the soil epidermis is taken out of the monitoring station, and the bait prepared in step 2) is placed in the monitoring station. The monitoring station prevents the bait from floating in the air and from contacting the soil, water bodies and other non-target organisms. Through the feeding behavior and trophallaxis behavior of termites, as well as the mechanism of action of fipronil or imidacloprid and the behavior of termites under a specific ratio of the agent, it is ensured that the termites can bring a large proportion of the placed bait back to the ant nest.

4) Regular inspection: After placing the bait, regularly monitor the bait in the monitoring station and replenish the bait in time. The total amount of the bait placed should be greater than the median lethal dose _LD50 and reach the absolute lethal dose _LD100 to ensure that the termite colony is eliminated and the entire nest of termites is eliminated. When there are no signs of termite activity detected in the dam or termite monitoring station for multiple monitoring cycles, the monitoring station will be replaced with monitoring wood for long-term monitoring.

The termite control and prevention methods for reservoir dams can achieve time control, targeted control and pollution control.

1. Time control: Apply pesticides at the right time. Apply pesticides before the peak season when termites feed and go out. At other times, only use luring and monitoring measures to reduce the exposure time of pesticides.

2. Targeted control: Apply pesticides to the target. Only target the termite population itself, and reduce the use and exposure of non-target objects: such as earthworms, soil microorganisms, fish, shrimps, water fleas, algae, natural enemies, etc.

3. Pollution control: soaking bait. Soak bait indoors in advance to improve on-site application methods. Place bait only in facilities to ensure isolation, no contact with soil or water, prevent drift, prevent leaching, and prohibit runoff, so as to reduce the impact on non-target organisms and the environment.

Embodiment 2

The difference between this embodiment and the first embodiment is that step 1) prepares the agent: using imidacloprid with an active ingredient content of 70% and a dosage form of water-dispersible granules, adding water according to a weight ratio, and the ratio of imidacloprid to water is 1:1000-1200 (imidacloprid with other active ingredient contents such as 10%, 15%, 20%, 35%, 80% and other suspensions, emulsions in water, water-dispersible granules, dispersible granules, etc. are all proportioned according to this concentration) to obtain an imidacloprid prepared agent.

Embodiment 3

The difference between this embodiment and the first embodiment is that step 3) placing bait: when signs of termite activity are found, and the number of previously buried monitoring stations is insufficient, or the monitoring stations are damaged and cannot be used, new bait stations can be buried in the annex, and the density of the bait stations can be increased according to the situation, and the bait prepared in step 2) is placed in the bait station, and the bait is isolated from soil, water, etc. through the bait station. The bait station can use the bait station sold on the market, and its selection standard is that it has a cover and a water barrier (or a baffle is set in the upper part of the dam body to prevent water from entering the upper part), to prevent water from accumulating in the bait station and to prevent the bait from rotting.

The reservoir dam is divided into multiple areas, or experiments are conducted in multiple reservoirs with similar conditions.

Experimental Example 1

In the period of frequent termite activity in April-June and October-November, experiments were conducted in the dam area, and there were obvious traces of termite activity in the experimental area, and there were traces of termite activity in the buried monitoring station. The method of embodiment one was used to prepare the flubendiamide preparation agent, and the flubendiamide preparation agent was used to soak the dried camphor bark (as shown in Figure 1), and bait was obtained, and the bait was placed in the monitoring station, and the area was regularly monitored, and the period of regular monitoring was different according to the experimental area. In the period when termites were killed, the monitoring cycle was arranged to be shorter, which was convenient for monitoring termite dynamics, checking whether there were traces of termites feeding in the monitoring station, checking whether the bait was sufficient, and supplementing the bait when insufficient. After completing the extermination of termites, the area was also continuously monitored, and the monitoring cycle was different according to the habit of termite activity, and in the frequent termite activity of April-June and October-November each year, at least 1 inspection was carried out in 1 month; in the infrequent months of other termite activities, at least 1 inspection was carried out in 2-3 months.

When the ratio of fipronil to water in the preparation of fipronil is 1:120, termites can go out to feed for up to 15-20 days. From the date the bait is placed in the monitoring station to 15-20 days, termites continue to bring the bait back to the nest from the monitoring station, and traces of termites feeding can be clearly observed in the monitoring station. After there were no signs of termite activity in the dam area and the monitoring station, the monitoring wood was replaced in the monitoring station for continuous monitoring. After 2-3 years of continuous monitoring, no signs of termite activity were found. This shows that the use of fipronil to prepare baits for termite control and prevention can achieve the extermination of the entire termite nest.

Experimental Example 2

The difference between Experimental Example 2 and Experimental Example 1 is that the ratio of fipronil to water in the preparation of the fipronil preparation is different. When the ratio of fipronil to water is 1:150, the termites can go out for food for 16-22 days; when the ratio of fipronil to water is 1:90, the termites can go out for food for 13-18 days; when the ratio of fipronil to water is 1:60, the termites can go out for food for 12-16 days; when the ratio of fipronil to water is 1:40, the termites can go out for food for 10-12 days. The greater the concentration of fipronil, the greater the toxicity, and the shorter the time for the termites to be observed to carry out feeding behavior. When the ratio of fipronil to water is 1:150, during the medication period, the activity traces of termites are significantly more than the activity traces of termites in the same period of Example 1, and the termites are active frequently, causing greater damage to the dam facilities. When the ratio of fipronil to water was 1:40, termites in some monitoring stations showed behavior of avoiding danger during the application period, causing the bait to lose its appeal. When the ratio of fipronil to water was 1:60-120, it could ensure that termites could fully feed and achieve the extermination of the entire termite nest, while ensuring the efficiency of termite extermination and protecting the dam facilities.

Experimental Example 3

The difference between Experimental Example 3 and Experimental Example 1 is that, using the method of Example 2, imidacloprid is prepared, wherein the ratio of imidacloprid to water is 1: 1200 (by weight), imidacloprid is used to prepare camphor bark, bait is obtained, and the bait is placed in the monitoring station. In this experimental example, termites can go out to take food for up to 7-10 days. After there are no traces of termite activity in the dam area and the monitoring station, monitoring wood is replaced in the monitoring station for continuous monitoring, and no traces of termite activity are still found after continuous monitoring for 2-3 years. It can be seen that the use of imidacloprid to prepare bait for termite extermination and control method can achieve the whole nest extermination of termites.

When the ratio of imidacloprid to water is 1:1400, termites can go out to feed for 8-12 days; when the ratio of imidacloprid to water is 1:1000, termites can go out to feed for 6-8 days; when the ratio of imidacloprid to water is 1:800, termites can go out to feed for 5-6 days. The higher the concentration of imidacloprid, the greater the toxicity, and the shorter the time when termites can be observed to feed. When the ratio of imidacloprid to water is 1:1400, during the medication period, the traces of termite activity are significantly more than those when the ratio of imidacloprid to water is 1:1200 during the same period. Termites are active frequently and cause great damage to dam facilities. When the ratio of imidacloprid to water is 1:800, during the medication period, termites in some monitoring stations showed behavior to avoid danger, causing the bait to lose its appeal. When the ratio of imidacloprid to water is 1:1000-1200, it can ensure that termites can fully feed and can achieve the extermination of the entire termite nest. At the same time, it can ensure the efficiency of termite extermination and protect the dam facilities.

Comparative Example 1

The difference between Comparative Example 1 and Experimental Example 1 is that a 10% active ingredient content bifenthrin suspension formulation is used to prepare the agent, and water is added according to the volume ratio, the ratio of bifenthrin to water is 100:150-200, and the prepared bifenthrin agent is used to soak camphor bark to obtain a bait, and the bait is placed in the monitoring station. When the ratio of bifenthrin to water is 100:150-200, the termites can go out to feed for 2-5 days. In most monitoring stations, termites clearly show behaviors of avoiding danger, causing the bait to lose its attractiveness. After the medication, there are still traces of termite activity in the dam area. It can be seen that the bait prepared with bifenthrin can only kill termites in large quantities in a short period of time, but cannot achieve the whole nest of termites. The termite control effect is obviously not as good as the control effect of Experimental Examples 1 to 3.

Comparative Example 2

The difference between Comparative Example 2 and Experimental Example 1 is that the method of Example 1 is used to prepare the fipronil preparation agent, and the fipronil preparation agent is used to soak fresh camphor bark, and the soaking time and room temperature are the same as those of Example 1. The bark is fished out and dried in the shade at room temperature in a ventilated place avoiding direct sunlight to obtain a bait. The bait is placed in a monitoring station and the area is regularly monitored. The termite outing feeding activity time of Comparative Example 2 is significantly longer than the termite outing feeding activity time of Example 1 under the same conditions, which is 3-4 days longer. During the medication period, the activity traces of the termites are also significantly more than the activity traces of the termites of Example 1. The termites are active frequently, and the bait made of the bark has little effect on the termite feeding activity, and the prevention effect is poor.

Comparative Example 3

The difference between Comparative Example 3 and Experimental Example 1 is that dry bark with a relatively smooth surface and fewer holes or cracks is used, such as the dry poplar bark shown in Figure 2. The fipronil-prepared agent is prepared by the method of Example 1, and the bark is soaked with the fipronil-prepared agent to obtain a bait. Under the same other conditions, the bark soaking time of Comparative Example 3 is significantly longer than the bark soaking time of Implementation 1, and the time for shade drying is also significantly longer than the shade drying time of the bark of Implementation 1. The bait is placed in a monitoring station and the area is regularly monitored. The termites of Comparative Example 3 go out for feeding activities for a period of 10-20 days, which is significantly longer than the termites of Implementation 1 under the same conditions.

The above are only embodiments of the present invention. The invention is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims (10)

1. A method for controlling termites in reservoir dams, characterized in that it comprises the following steps: 1) Using fipronil or imidacloprid to prepare the medicament; 2) soaking the bark with a prepared drug to obtain a bait; 3) Place the bait and have the termites take it back to the nest. 2. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 1), the concentration of the prepared agent is less than the lethal concentration. 3. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 3), the dosage of the agent contained in the bait placed is greater than the lethal dose. 4. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 1), the concentration of the prepared agent is 0.5-0.7 times the lethal concentration. 5. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 1), fipronil with an active ingredient content of 25 g/L and an emulsifiable concentrate is added with water in a volume ratio, and the ratio of fipronil to water is 1:60-120 to obtain a fipronil formulation. 6. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 1), imidacloprid with an active ingredient content of 70% and a dosage form of water-dispersible granules is used, and water is added according to a weight ratio, and the ratio of imidacloprid to water is 1:1000-1200 to obtain an imidacloprid formulation. 7. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 2), the bark is soaked with the prepared agent until the bark is soaked, the bark is fished out and dried in a ventilated place away from direct sunlight to obtain the bait. 8. A method for controlling termites in reservoir dams according to claim 7, characterized in that: in step 2), the bark is dry bark with a rough surface and many holes or cracks. 9. A method for controlling termites in reservoir dams according to claim 7, characterized in that: in step 2), the soaking time of the bark is 48-72 hours. 10. A method for controlling termites in reservoir dams according to claim 1, characterized in that: in step 3), the bait is placed in a device that isolates soil and water; after the bait is placed, the bait is regularly monitored and replenished.